Carburetor



Jan. 11, 1938. F-. N. RUSSELL 2,105,300

CARBURETOR Filed March 13, 1937 VIII/II, A

ATTORN EYS Patented Jan. 11, 1938 UNITED STATES PATENT OFFICE Application March 13,

4 Claims.

This invention relates to carburetors, and has for an object to provide a construction wherein there is provided an improved carburization of the gasoline before it reaches the intake mani- 5 fold of an engine.

Another object of the invention is to provide a carburetor having a mixing or vaporizing chamber wherein atomized gasoline is discharged.

An additional object of the invention is to provide a carburetor having an atomizing structure for directing a mixture of air and gasoline to an outlet together with auxiliary air supplying means for providing air at different points along the travel of the air and gasoline mixture.

In the accompanying drawing:

Fig. 1 is a longitudinal vertical sectional view through a carburetor disclosing an embodiment of the invention;

Fig. 2 is a horizontal sectional view through Fig. 1 approximately on the line 2-2;

Fig. 3 is a transverse sectional View through Fig. 1 on the line 33;

Fig. 4 is a transverse sectional view through Fig. 1 on the line 4-4;

Fig. 5 is a fragmentary side View showing an accelerator lever and associated parts embodying certain features of the invention;

Fig. 6 is an elevation of one of the valves shown in Fig. 1, the same being on an enlarged scale;

Fig. '7 is a fragmentary sectional view through Fig. 6 approximately on the line 7-7.

Referring to the accompanying drawing by numerals, I indicates a tubular pipe forming part of the outlet member 2. The tubular outlet ex- 35' tension I is adapted to be bolted or otherwise rigidly secured to an intake manifold of an internal combustion engine. If desired, a butterfly throttle valve 3 could be arranged in the tubular member l near the outlet end. However, this throttle valve, which is the usual kind now in common use, could be eliminated, but if used it must be connected up to function in synchronism with the valve member 4 hereinafter more fully described.

The tubular outlet 2 is formed as a T-shaped member with the legs and 5 connected respectively to the casing l and the pipe 8. Pipe 8 acts as an auxiliary air inlet pipe and is provided with the usual butterfly choke valve 9. Casing l with portion ill of leg 5 forms a vaporizing chamber having a throat or outlet passageway I I discharging into the tubular outlet 2. An abutment or wall I2 is arranged in line with the center of the tubular outlet 2 and forms a division wall between the vaporizing chamber [0 and the air inlet 8. It will be noted that by reason of 1937, Serial No. 130,636

the throats H and H the vaporized or atomized gasoline and the air both enter the tubular outlet 2 in parallel streams. These streams mix as they pass upwardly to the outlet end of member i. In case any uncarbureted gasoline passes into the member I, it is supplied with fresh air from the respective pipes l3 and [4 which are of different heights. These pipes are carried by wall l2 and extend centrally into the tube l. Wall 2 is provided with a passageway l5 for each of the pipes I3 and I4 so that air passing inwardly through the auxiliary air inlet 8 will strike wall l2 and part of the air will be deflected upwardly and part will pass into the passageways l5 and thence through pipes i3 and I4.

As shown in Fig. 1, there is provided a float chamber l6 which is adapted to carry a supply of gasoline. This float chamber may be of any desired kind and is provided with a float ll regulating the valve l8 through which gasoline passes from the supply pipe IS. The lid or cover may be secured to the chamber IS in any desired way and a Supporting pipe 2| is secured to lid 12 by nuts 22 and 23. Pipe 2| is screwed into a suitable threaded opening 24 formed in casing 'i so that a plurality of tubes 25 may extend from near the bottom of chamber [6 upwardly into the chamber l0. These pipes may be held in place by friction or other means and are slightly bent at the upper ends as shown in Figs. 1 and 4. Also it will be observed that the upper ends are at different elevations coacting with the passageways or apertures 26, 21, and 28 formed in the valve casing 29, which casing has a bore for accommodating the valve 4, passageways 30, 3|, and 32, as well as the chamber 33. An air inlet pipe 34 continually comunicates with the chamber 33 and is supplied with air from a suitable source of compressed air, as for instance a pump or a tank filled with compressed air. From this it will be seen that whenever valve 4 is open fully or partly, air will rush into the chamber I0 and will pass over one or more of the upper ends of tubes 25 whereby gasoline will be drawn up the tubes and discharged with the air into chamber NJ in an atomizing manner.

The valve 4, as shown more particularly in Figs. 6 and 7, is provided with passageways 35, 36 and 3'! cooperating with the passageways 30, 3| and 32 and the outlet openings 26, 21 and 28. By this arrangement when the valve 4 turns a certain distance, air will pass through passageway and blow across the top of the lowermost tube 25 so as to provide a certain volume of vaporized or atomized gasoline. If the valve 4 is turned a further distance, air will pass through the passageways 35 and 36 so that gasoline will be fed from the second highest tube 25, and if the valve 4 is turned to its full open position, air will pass through all three passageways in the valve so that a maximum atomizing effect is produced and consequently a maximum supply of vaporized gasoline is directed to the tubular outlet 2.

' Valve a is provided with an enlarged end 38 as shownin Fig. 2, which limits the movement of the valve as it is inserted into proper position whereby the various passageways will properly register. An accelerator or throttle lever 39 is secured to the protruding end of valve; 4 so as to hold the valve in proper place and also to rotate the valve. This lever may be actuated through link le and other mechanism as may be desired. When the throttle vaive 3 is used it must be connected with the accelerator lever 39 in some manner so that it will be open as valve 4 opens. However, usually valve 3 is eliminated. A set scr w li acts to clamp lever 39 rigidly to the valve d and also projects outwardly sufficiently far to strike the pipe at and limit theopening movement of the lever so that the lever can not be moved further than a full open position for valve l. An adjustable abutment is also provided for lever 33. This consists of a screw 42 locked in place by a suitable lock 2, said screw being threaded into the extension a l of lever 39.

If desired,v the usual spring connected with accelerators may be connected with lever 39, link to, or any parts associated therewith, so that when the link "ii? is released the spring will automatically move lever 39 and associated parts in a direction for'closing valve In order to prevent a complete closing of the valve t so that the engine may idle, abutment S2 is adjusted and strikes the pipe 3 as shown in Fig. 5. This holds valve l sufficiently open to allow idling at any desired speed. 1

I claim:

i. A carburetor comprising a float chamber, means for directing gasoline into said chamber, a valve for controlling the action of said means, a float for controlling the action of said valve, a plurality of outlet tubes extending from near the bottom of said chamber to a point exteriorly of said chamber, the ends of said tubesexteriorly of said chamber being arranged in different planes, means for directing air under pressure across the tops of said ends for drawing gasoline from said tubes and vaporizing the gasoline at the same time, means forming a mixing chamber for said gasoline and air, an outlet tubular member adapted to lead to the intake manifold of an internal combustion engine, means forming an auxiliary air inlet leading into said outlet tubular member, a baiile between said vaporizing chamber and said air inlet means, and a plurality of pipes of different lengths extending from said abutment into said outlet tubular member for mixing air with the vaporized gasoline and any unvaporized gasoline from said vaporizing chamber, said abutment being formed with a passageway for each of said pipes, said passageways having respectively one end in free communication with said pipes and one end open to said auxiliary air inlet.

2. In a carburetor, means forming a T-shaped structure with one leg acting as an outlet, a second leg as an auxiliary air inlet, and the third leg as a vaporizing chamber, a wall arranged between said second and third legs in alignment with the first mentioned leg but spaced therefrom so that the second and third legs are in con- .tinuous communication with the lower end of the first mentioned leg, a plurality of pipes of different lengths extending from said wall into said first mentioned leg, said wall having a passageway for each of said pipes, said passageways opening into said auxiliary air inlet, a float chamber adapted to receive gasoline, a plurality of tubes extending from said float chamber into said vaporizing chamber, and means for directing air across the upper end of each or" said tubes, said means directing the air toward said vaporizing chamber, and means for regulating the air directed across said tubes.

3. In a carburetor, means forming a vaporizing chamber, means forming an auxiliary air inlet chamber, atubular outlet member appreciably longer than said vaporizing chamber, said outlet member having substantially equal sized openings registering with the vaporizing chamber and the air inlet member, tubes of different lengths extending into said outlet member centrally and longitudinally thereof, one end of each of said tubes opening into said air inlet chamber whereby air is supplied to said outlet member at its inlet end and at spaced points along its length, means for supplying gasoline to said vaporizing chamber, and means for directing air under pressure into said vaporizing chamber.

4. In a carburetor, tubular means formed with a tubular outlet member substantially centrally thereof, said outlet member extending substantially at right angle to said tubular means, a division member positioned substantially centrally or" said tubular means, said division member extending to near said outlet member for dividing said tubular means into an air inlet chamber and a vaporizing chamber, both of said chambers discharging into said outlet member above said division member, a valve in said air inlet chamber for controlling the air passing therethrough, a plurality of tubes extending into said vaporizing chamber for directing carburetable fuel into said vaporizing chamber, and means at the end of said vaporizing chamber opposite said division member for directing air under pressure across the tops of said tubes for drawing fuel into said vaporizing chamber.

FRANK N. RUSSELL. 

